>> what did you see? >> the car hit them, head-on. just went flying through the air. >> no brakes, nothing? >> no, just as fast as we could. >> both the driver and the passenger fled from the vehicle. the one individual returned. he's in his early 20s, claimed to be the driver. there is evidence of objective symptoms of intoxication. >> reporter: the child, the little boy, is 11 years old. we're told that he's expected to be okay. the adults were airlifted to john meier medical center, we're told, with severe injuries. antioch police say they're not even sure if the driver, who's now in custody, is really the driver or might actually be the passenger, who isn't telling the truth about what happened here. this person that they have in custody, though, they say, is in his 20s from oakland. the actual passenger, they say, has an outstanding warrant that they didn't say what for. we're also told that counselors will will be at the school today, helping any kids who might need it, and in case they saw anything.